Abstract




 
   

IJE TRANSACTIONS C: Aspects Vol. 32, No. 3 (March 2019) 424-429   

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  FLUORIDE PRECIPITATION OF CU OVER FE IN A SELECTED PH WINDOW
 
S. E. Rezaei and S. K. Sadrnezhaad
 
( Received: July 20, 2018 – Accepted in Revised Form: March 07, 2019 )
 
 

Abstract    Fe is an impurity in most leach liquors. Its coexistence with copper in leaching solution of chalcopyrite (CuFeS2) which is the most important mineral of copper creates major extraction problems. Hydrochloric acid dissolves both copper and iron during chloride leaching of this mineral. Separation of Fe from Cu is thus necessary to obtain pure copper. This paper presents a novel method for precipitation of Cu over Fe from mixed chloride acidic liquors. Hydrofluoric acid is used as the major unraveling agent. Kinetic studies show that a second-order CuCl2 precipitation reaction with a chemical rate constant of k = 0.416 L/mol prevails the process at the room temperature. For validation of the results, precipitate characterization by x-ray fluorescence (XRF) and x-ray diffraction (XRD) and solution analysis by atomic absorption spectrometry (ABS) are performed. Nitrogen presence is shown to help separation of iron from copper. The optimum value of pH (1.09) is achieved when nitrogen helps parting of 99 % iron II ions in the solution and sole deposition of copper II chloride precipitate.

 

Keywords    Chalcopyrite; Chloride Leaching; Copper-Iron Separation; CuF2 Deposition; Reaction Mechanism

 

چکیده   

آهن در بسیاری از محلولهای لیچینگ وجود دارد. همزیستی آهن با مس در محلول لیچینگ کالکوپرایت (CuFeS2) که مهمترین ماده معدنی مس است، باعث ایجاد مشکلات عدیده ای در فرایند استخراج می شود. زیرا اسید هیدروکلریک مورد استفاده در لیچینگ کلریدی کالکوپرایت، هر دو عنصر مس و آهن را حل می کند. بنابراین برای تهیه مس خالص، لازم استFe ازCu جدا شود. این مقاله روش جدیدی برای رسوب دادن Cu در برابر Fe از محلول اسیدی حاوی کلریدها ارائه می دهد. در این تحقیق، اسید هیدروفلوئوریک به عنوان عامل اصلی جداسازی آهن از مس مورد استفاده قرار می گیرد. مطالعات سینتیکی نشان می دهد که راسب شدنCuCl2 طبق یک واکنش درجه دو با ثابت سرعتk = 0.416 L/mol در دمای اتاق اتفاق می افتد. برای اعتبار سنجی نتایج، مشخصه رسوب توسط اشعه ماوراء بنفش (XRF) و پراش اشعه ایکس(XRD) و تجزیه و تحلیل با اسپکترومتر جذب اتمی(ABS) انجام شده که نشان می دهد که حضور نیتروژن، جداسازی آهن از مس را تسهیل می کند. مقدار pHبهینه (1.09) موقعی به دست می آید که نیتروژن با جدایش 99٪ یون آهنII موجود در محلول، باعث رسوب همه کلرید مس II و بدین ترتیب جدایش تقریبا" کامل دو عنصر می شود.

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